Name: ___________________


kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Middle/High School Algebra, Geometry, and Statistics (AGS)
9.18 Frequency Polygon without Histograms

Frequency Polygons can be drawn independently without drawing the histograms.
In drawing a histogram of a given frequency distribution, we take the following steps:

Step 1. : If the frequency table is in the inclusive form, we first convert it into an exclusive form and make it a continuous interval.
Step 2. :To complete the polygon we assume a class interval with zero frequency preceding the first class interval and a class interval with zero frequency succeeding the last class interval.
Step 3. : Taking a suitable scale, we represent class marks along x axis.
Step 4. : Taking a suitable scale, we represent frequency along y axis.
Step 5. : We plot the corresponding points and join it with the help of line segment.
Consider the following example.
In a city, the following weekly observations were made in a study on cost of living index :

Following is the frequency polygon for the above data

Directions: On the basis of the given information answer the following questions

Q 1: The lower limit for the fifth class interval is

Q 2: Which class interval has the lowest frequency?
170 - 180
140 - 150
180 - 190
190 - 200

Question 3: This question is available to subscribers only!

Question 4: This question is available to subscribers only!

Subscription to kwizNET Learning System costs less than $1 per month & offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements

© 2003-2007 kwizNET Learning System LLC. All rights reserved. This material may not be reproduced, displayed, modified or distributed without the express prior written permission of the copyright holder. For permission, contact
For unlimited printable worksheets & more, go to